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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | The following table shows estimated useful lives of property, plant and equipment:
Property, plant and equipment |  | Useful Life
Buildings |  | 40 to 50 years
Leasehold improvements |  | Lesser of lease term or the life of the asset
Machinery, equipment and furniture |  | 3 to 10 years
Computer software |  | 5 to 10 years
The components of net property, plant and equipment were as follows:
| December 31,
(in millions) | 2020 |  | 2019
Land and improvements | $ | 23.2 |  |  | $ | 24.0 |
Buildings and improvements to leaseholds | 145.9 |  |  | 145.0 |
Machinery and equipment | 480.4 |  |  | 475.1 |
Construction in progress | 8.3 |  |  | 7.6 |
| 657.8 |  |  | 651.7 |
Less: accumulated depreciation | (416.4) |  |  | (384.6) |
Property, plant and equipment, net(1) | $ | 241.4 |  |  | $ | 267.1 |
(1)Net property, plant and equipment as of December 31, 2020 and 2019 contained $65.8 million and $68.5 million of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Depreciation expense for software was $11.4 million, $8.9 million and $8.2 million for the years ended December 31, 2020, 2019 and 2018, respectively.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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